Pre-coding and decoding method
A decoding method and precoding technology, applied in multi-frequency code systems, digital transmission systems, electrical components, etc., can solve the problems of resource waste at the transmitting end of the system, unfavorable processing at the receiving end of the system, and increase in signal peak-to-average ratio.
Inactive Publication Date: 2014-04-02
FUDAN UNIV
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[0004] However, because the precoding scheme in the prior art introduces an additional guard time interval, the limited resources at the system transmitting end are further wasted, which makes the processing at the system receiving end unfavorable for realization, and several positive values will appear in the same time slot function|P n (t)|Peak superposition, which in turn will increase the peak-to-average ratio of the entire system signal
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[0056] In order to make the object, technical solution and advantages of the present invention clearer, various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that, in each implementation manner of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.
[0057] The first embodiment of the present invention relates to a precoding method. Contains the following steps:
[0058] The original signal is modulated into an original symbol group X by using quadrature amplitude modulation QAM;
[0059] Performing precoding processing on the X by using a precoding matrix P to obtain ...
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The invention relates to the field of optical communication and discloses a pre-coding and decoding method. The method comprises the following steps: firstly, an original signal is modulated into an original symbol group X through QAM (Quadrature Amplitude Modulation), pre-coding processing is then carried out on the X by adopting a pre-coding matrix P to obtain a pre-coding symbol group Y, and the Y is finally modulated into a pre-coding QAM-OFDM (Orthogonal Frequency Division Multiplexing) signal through OFDM, wherein pm is an element in P, n refers to a fast Fourier transform coefficient in a positive value function Pn(t), and the Pn(t) is a function composed of one group of sub-functions which have cyclic shift properties at a given time interval [0, T]. Compared with the prior art, the method has the advantages the condition of peak value superposing in the same time slot in the system is eliminated, pre-coding redundancy can be included in the OFDM signal of the system self, and in fact, the data resource of a transmitting end part is occupied to exchange a lower peak-to-average ratio; besides, as an extra protecting time interval does not need to be increased, the processing of the receiving end of the system is easier to realize.
Description
technical field [0001] The invention relates to the field of optical communication, in particular to a precoding method and a decoding method thereof. Background technique [0002] OFDM (Orthogonal Frequency Division MultiPlexing, Orthogonal Frequency Division Multiplexing) technology is widely used in optical access network systems, such as visible light communication systems (VLC: Visible Light Communication), passive optical network system (PON: Passive OPtical Network), optical wireless communication system (RoF: Radio Over Fiber) and ultra-wideband communication system (UWB: Ultra-Wide Bandwidth). However, the high PAPR (Peak to Average Power Ratio, peak-to-average power ratio) of the OFDM signal has become one of the main bottlenecks limiting its application. Because a high PAPR will not only lead to the degradation of the performance of the linear power amplifier, but also have a direct impact on the overall performance of the system. At present, the main ways to su...
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Login to View More IPC IPC(8): H04L27/26H04L27/34H04L1/00
Inventor 迟楠王燕瑾
Owner FUDAN UNIV